[Non-Sequitur]

So if half believe and half don't it just means that the Darwin Theory is still just a theory.

And flight is just a theory and relativity is just a theory and gravity is just a theory and so forth and so on.

[Dustbunny]

Yep you are right there but they are backed by fact.

[Donald Rumsfeld Fan]

gravity is just a theory

We still can't agree on what it is exactly. Other than some kind of attractive force.

In physics, gravitation or gravity is the tendency of objects with mass to accelerate toward each other. Gravitation is one of the four fundamental interactions in nature, the other three being the electromagnetic force, the weak nuclear force, and the strong nuclear force. Gravitation is the weakest of these interactions, but acts over great distances and is always attractive. In classical mechanics, gravitation arises out of the force of gravity (which is often used as a synonym for gravitation). In general relativity, gravitation arises out of spacetime being curved by the presence of mass, and is not a force. In quantum gravity theories, either the graviton is the postulated carrier of the gravitational force.[1], or time-space itself is envisioned as discrete in nature, or both.

..Wikpedia excerpt